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Sax took a solo rover and drove it down the steep bare southern slope of Pavonis Mons, then across the saddle between Pavonis and Arsia Mons. He contoured around the great cone of Arsia Mons on its dry eastern side. After that he drove down the southern flank of Arsia, and of the Tharsis Bulge itself, until he was on the broken highlands of Daedalia Planitia. This plain was the remnant of a giant ancient impact basin, now almost entirely erased by the uptilt of Tharsis, by lava from Arsia Mons, and by the ceaseless winds, until nothing was left of the impact basin except for a collection of areologists’ observations and deductions, faint radial arrays of ejecta scrapes and the like, visible on maps but not in the landscape. To the eye as one traveled over it, it looked like much of the rest of the southern highlands: rugged bumpy pitted cracked land. A wild rockscape. The old lava flows were visible as smooth lobate curves of dark rock, like tidal swells fanning out and down. Wind streaks both light and dark marked the land, indicating dust of different weights and consistencies: there were light long triangles on the southeast sides of craters and boulders, dark chevrons to the northwest of them, and dark splotches inside the many rimless craters. The next big dust storm would redesign all these patterns. Sax drove over the low stone waves with great pleasure, down down up, down down up, reading the sand paintings of the dust streaks like a wind chart. He was traveling not in a boulder car, with its low dark room and its cockroach scurry from one hiding place to the next, but rather in a big boxy areologist’s camper, with windows on all four sides of the third-story driver’s compartment. It was a very great pleasure indeed to roll along up there in the thin bright daylight, down and up, down and up, down and up over the sand-streaked plain, the horizons very distant for Mars. There was no one to hide from; no one hunting for him. He was a free man on a free planet, and if he wanted to he could drive this car right around the world. Or anywhere he pleased. The full impact of this feeling took him about two days’ drive to realize. Even then he was not sure that he comprehended it. It was a sensation of lightness, a strange lightness that caused little smiles to stretch his mouth repeatedly for no obvious reason. He had not been consciously aware, before, of any sense of oppression or fear—but it seemed it had been there—since 2061, perhaps, or the years right before it.
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